| 摘要 |
Reversible puller for quickly pulling drill rods from, or for re-inserting drill rods into, drill hole. Rock drill has drill head mounted on feed carriage, drill head including rod rotating structure for rotating drill rod when in drilling mode. Rod puller includes drive wheel and idler wheel mounted for rotation with peripheries adapted for engagement with drill rod. Drive wheel is coaxial with, and rotates with, rod rotating structure and idler wheel cooperates with drill head for movement relative to drive wheel to permit idler wheel to be positioned so as to be essentially coplanar with drive wheel with wheel axes parallel. Drill head is swivellably mounted on carriage to permit drill head to be positioned in rod pulling mode wherein wheel axes are disposed generally normally to drill rod axis and periphery of drive wheel is spaced closely adjacent drill rod. Idler wheel is moved so that drill rod is squeezed between idler and drive wheels for moving rod in desired direction.
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